Did your favourite spell get left out of the list in the Mythic Adventures book?
If you are seeking to amp up a spell not on that list, fret not, for this collection of 'Missing Mythic Magic' provides many an idea for ways in which a mythic spellcaster can enhance even more spells.
The spells presented are based on ones in the core Pathfinder RPG rulebook. You will need to refer to this, as often the descriptions deal with amendments where it will be necessary to know what the original spell's effects are like to apply them. Many also have potential augumentations, which can kick in at higher levels if you are prepared to spend extra mythic energy on your casting.
Most of the effects are of the 'bigger' or 'more damage' variety, but some provide additional effects. For example, when using Alter Self, you can actually take on specfic abilities of the race you choose to appear as, along with the physical features. So if you want to look like an elf, you can acquire the elven immunities and keen senses racial features that elves have, and so on.
The spells covered are acid arrow, acid fog, acid flash, aid, air walk, alarm, align weapon, alter self, analyse dweomer, animal growth, animal messenger, animal shapes, animal trance, animate rope, and anti-life shell. So if one of these is a spell you like to enhance mythically, this is for you. Hopefully, there's more to come...